Semiconductor integrated circuit device

Patent metadata

Field	Value
Publication number	US-2016276989-A1
Application number	US-201514638630-A
Country	US
Kind code	A1
Filing date	Mar 4, 2015
Priority date	Mar 25, 2014
Publication date	Sep 22, 2016
Grant date	—

Abstract

A device includes an operational-amplifier including an amplifier-part amplifying signals and transmitting amplified signals to a first and a second nodes, and an output-part connected to the first and second nodes and outputting signals from a first and a second outputs. The device includes a first and a second chopper switches and a first and second phase-compensation capacity elements. A first capacitance switch switches between a first connection-state and a second connection-state. In the first connection-state, the first phase-compensation-capacity element is connected between the first node and the first output and the second phase-compensation-capacity element is connected between the second node and the second-output. In the second connection state, the first phase-compensation-capacity element is connected between the second-node and the second output and the second phase-compensation-capacity element is connected between the first node and the first output.

First claim

1 . A semiconductor integrated circuit device comprising:
an operational amplifier including an amplifier unit amplifying signals input in a first input port and a second input port and transmitting amplified signals to a first node and a second node, and an output unit being connected to the amplifier unit at the first and second nodes and outputting the amplified signals from a first output port and a second output port; a first chopper switch unit modulating a first signal and a second signal and inputting the modulated first and the second signals in the first and second input ports; a second chopper switch unit demodulating and outputting the amplified signals output from the first and second output ports; a first phase compensation capacity element; a second phase compensation capacity element; and a first capacitance switching unit switching between a first connection state and a second connection state, the first connection state being a state where the first phase compensation capacity element is connected between the first node and the first output port and the second phase compensation capacity element is connected between the second node and the second output port, the second connection state being a state where the first phase compensation capacity element is connected between the second node and the second output port and the second phase compensation capacity element is connected between the first node and the first output port.

2 . The device of claim 1 , wherein
the first chopper switch unit alternately operates a first input operation and a second input operation with a first frequency, the first and second signals being respectively input in the first input port and the second input port in the first input operation, and the first and second signals being respectively input in the second input port and the first input port in the second input operation, the first capacitance switching unit switches the first connection state and the second connection state with the first frequency, and the second chopper switch unit demodulates the amplified signals from the first and second output ports with the first frequency and outputs the demodulated signals.

3 . The device of claim 1 , wherein the first capacitance switching unit includes a first switch unit electrically connecting and disconnecting the first phase compensation capacity element between the first node and the first output port, a second switch unit electrically connecting and disconnecting the second phase compensation capacity element between the second node and the second output port, a third switch unit electrically connecting and disconnecting the first phase compensation capacity element between the second node and the second output port, and a fourth switch unit electrically connecting and disconnecting the second phase compensation capacity element between the first node and the first output port.

4 . The device of claim 2 , wherein the first capacitance switching unit includes a first switch unit electrically connecting and disconnecting the first phase compensation capacity element between the first node and the first output port, a second switch unit electrically connecting and disconnecting the second phase compensation capacity element between the second node and the second output port, a third switch unit electrically connecting and disconnecting the first phase compensation capacity element between the second node and the second output port, and a fourth switch unit electrically connecting and disconnecting the second phase compensation capacity element between the first node and the first output port.

5 . The device of claim 3 , wherein
the first switch unit includes a first switch being connected between the first node and one end of the first phase compensation capacity element, and a second switch being connected between the other end of the first phase compensation capacity element and the first output port, the second switch unit includes a third switch being connected between the second node and one end of the second phase compensation capacity element, and a fourth switch being connected between the other end of the second phase compensation capacity element and the second output port, the third switch unit includes a fifth switch being connected between the second node and one end of the first phase compensation capacity element, and a sixth switch being connected between the other end of the first phase compensation capacity element and the second output port, and the fourth switch unit includes a seventh switch being connected between the first node and one end of the second phase compensation capacity element, and an eighth switch being connected between the other end of the second phase compensation capacity element and the first output port.

6 . The device of claim 4 , wherein
the first switch unit includes a first switch being connected between the first node and one end of the first phase compensation capacity element, and a second switch being connected between the other end of the first phase compensation capacity element and the first output port, the second switch unit includes a third switch being connected between the second node and one end of the second phase compensation capacity element, and a fourth switch being connected between the other end of the second phase compensation capacity element and the second output port, the third switch unit includes a fifth switch being connected between the second node and one end of the first phase compensation capacity element, and a sixth switch being connected between the other end of the first phase compensation capacity element and the second output port, and the fourth switch unit includes a seventh switch being connected between the first node and one end of the second phase compensation capacity element, and an eighth switch being connected between the other end of the second phase compensation capacity element and the first output port.

7 . The device of claim 3 , wherein
the first and second switch units perform a same switching operation with the first frequency, the third and fourth switch units perform a same switching operation with the first frequency, the first switch unit and the third switch unit perform a switching operation with the first frequency in a mutually complementary manner, and the second switch unit and the fourth switch unit perform a switching operation with the first frequency in a mutually complementary manner.

8 . The device of claim 5 , wherein
the first and second switch units perform a same switching operation with the first frequency, the third and fourth switch units perform a same switching operation with the first frequency, the first switch unit and the third switch unit perform a switching operation with the first frequency in a mutually complementary manner, and the second switch unit and the fourth switch unit perform a switching operation with the first frequency in a mutually complementary manner.

9 . The device of claim 1 , further comprising:
a third phase compensation capacity element being connected between the first node and the first output port; and a fourth phase compensation capacity element being connected between the second node and the second output port.

10 . The device of claim 2 , further comprising:
a third phase compensation capacity element being connected between the first node and the first output port; and a fourth phase compensation capacity element being connected between the second node and the second output port.

11 . The device of claim 3 , further comprising:
a third phase compensation capacity element being connected between the f

Assignees

• Toshiba Kk

Inventors

• Nakatsuka Shinji
• Imai Shigeo
• Ogawa Yosuke

Classifications

• H03F2203/45248

  the dif amp being designed for improving the slew rate · CPC title

• H03F2200/271

  the DC-isolation amplifier, e.g. chopper amplifier, modulation/demodulation amplifier, uses capacitive isolation means, e.g. capacitors · CPC title

• H03F3/387

  with semiconductor devices only · CPC title

• H03F2200/312

  the loading circuit of an amplifying stage comprising one or more switches · CPC title

• H03F3/45475

  using IC blocks as the active amplifying circuit · CPC title